Considering how the fear of global warming is inspiring the world’s politicians to put forward the most costly and economically damaging package of measures ever imposed on mankind, it is obviously important that we can trust the basis on which all this is being proposed. Last week two international conferences addressed this issue and the contrast between them could not have been starker.

The first in Copenhagen, billed as “an emergency summit on climate change” and attracting acres of worldwide media coverage, was explicitly designed to stoke up the fear of global warming to an unprecedented pitch. As one of the organisers put it, “this is not a regular scientific conference: this is a deliberate attempt to influence policy”.

What worries them are all the signs that when the world’s politicians converge on Copenhagen in December to discuss a successor to the Kyoto Protocol, under the guidance of the UN Intergovernmental Panel on Climate Change (IPCC), there will be so much disagreement that they may not get the much more drastic measures to cut carbon emissions that the alarmists are calling for.

Thus the name of the game last week, as we see from a sample of quotations, was to win headlines by claiming that everything is far worse than previously supposed. Sea level rises by 2100 could be “much greater than the 59cm predicted by the last IPCC report”. Global warming could kill off 85 per cent of the Amazon rainforest, “much more than previously predicted”. The ice caps in Greenland and Antarctica are melting “much faster than predicted”. The number of people dying from heat could be “twice as many as previously predicted”.

None of the government-funded scientists making these claims were particularly distinguished, but they succeeded in their object, as the media cheerfully recycled all this wild scaremongering without bothering to check the scientific facts.